SMAR JB400 User manual

Brand: SMAR

Model: JB400

Type: User manual

SMAR JB400 is an intelligent junction box for fieldbus installations, complying with the IEC 61158-2 standard (PROFIBUS-PA and Foundation fieldbus). It offers intelligent protection against short circuits in each spur, preventing the short circuit propagation. After removing the short circuit, the spur goes back to normal operation. The JB400 also has an integrated bus terminator and is easy to install and maintain during operation. With its 4, 6, or 8 spurs, the JB400 is a versatile solution for a variety of fieldbus applications.

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JB400 – Instruction and Installation Manual

AVOIDING ELECTRICAL DISCHARGES

ATTENTION

Electrostatic discharges may damage semiconductor electronic components in printed circuit

boards. They usually occur when touching components or connector pins from devices, without

wearing the appropriate equipment to prevent discharges. It is recommended to take the following

precautions:

• Before handling the devices, remove the electrostatic charge from your body by wearing a

proper wristband or touching grounded devices;

• Avoid touching electronic components or connector pins of the devices.

PREVENTING LOW INSULATION AND HUMIDITY

ATTENTION

Use suitable cable glands, and properly seal the JB400

cover and unused connections. The

humidity can cause low insulation, damaging signals and electronic circuits. This type of problem is

not covered by Smar warranty.

JB400 – Instruction and Installation Manual

JB400 – INTELLIGENT JUNCTION BOX

Description

JB400 offers spur protection against short circuits (between + and – terminals), limiting the short

circuit current in each spur at 50 mA. During a short circuit situation there is no effect in the other

spur or the main trunk. There is a LED to indicate short circuits and JB400 has an integrated bus

terminator.

In normal operation, each short circuit protector consumes less than 1 mA. After removing the short

circuit, the spur goes back to normal operation and the protection circuit is disabled, and the LED is

dimmed.

Main characteristics

• Intelligent Junction Box for fieldbus installations in compliance with the IEC61158-2 standard

(PROFIBUS-PA and Foundation fieldbus);

• 4, 6 or 8 spurs;

• Intelligent protection against short circuit in each spur, preventing the short circuit propagation.

After removing the short circuit, the spur goes back to normal operation;

• Quick and easy installation;

• Maintenance during operation;

Figure 1 – JB400

Installation

• Mount the JB400 in easy access place to connections. The JB400 must be properly

located so as to minimize the length of spurs to the devices.

• The JB400 can be mounted directly on walls or panels using fixation screws.

• Close and seal unused connections properly to meet the protection class IP66

requirements.

IMPORTANT

Close the JB400 properly and ensure the correct cable glands mounting.

Close unused

connections properly, preventing humidity penetration, as it can generate low insulation. In

situations with humidity, JB400 damage is not covered by warranty.

JB400 – Instruction and Installation Manual

Wiring Diagram

Technical Specifications

CHARACTERISTICS

Physical layer

In compliance with IEC 61158-2

Power supply

Bus-powered 9 to 32 Vdc

Communication protocols

Profibus-PA and F

OUNDATION

fieldbus

Maximum trunk current

2.5 A

Quiescent current per spur in normal

operation

< 1 mA

Maximum current per spur during a

short circuit

50 mA

Maximum voltage drop per spur

0.3V@20mA

Number of spurs

4, 6 or 8

Spur connections

Removable 3-pin terminal blocks, 2.5 mm²

Surge protector at input

Cut in 62 V, 1500 W

Cover closing

4 screws with O-ring

Housing Material

Aluminum

Mounting

Via screws (for panel) or support with pipe

clamp

Protection degree

IP 66

Terminator

100 Ω resistor and 1µF capacitor selectable by

switch

Status LED

On (red): spur in short circuit condition;

Off: spur in normal operation

ENVIRONMENTAL CONDITIONS

Operation Temperature

-20°C to 70°C

Storage

-40°C to 85°C

Humidity

0-95% non-condensing

DIMENSIONS AND WEIGHT

Dimensions (mm)

180 x 180 x 100

Weight

1.6 kg

Short Circuit

Protection Short Circuit

Protection

S S

Esclosure

Ground

Spur 1 Spur N

N = 4, for model with 4 spurs.

N = 6, for model with 6 spurs.

N = 8, for model with 8 spurs.

JB400 – Instruction and Installation Manual

Exploded View and Dimensional Drawing

EXPLODED VIEW - JB-400 8 SPURS

Identification plate

Housing fixation screw

Cover

WSP300-8

WSP300 fixation rail

Fixation bracket for 2" pipes

M20x1.5 cable gland (black)

Spur box

M20x1.5 cable gland (gray)

JB400 – Instruction and Installation Manual

Ordering Code

MODEL

JB400

INTELLIGENT JUNTION BOX

COD.

Number of Spurs

4 Spurs

6 Spurs

8 Spurs

COD.

Electrical Connections

M20 X 1,5 (cable gland included)

COD.

Mounting bracket

Without bracket

Carbon steel bracket

Stainless steel bracket

COD.

Technology

P FOUNDATION fieldbus

PROFIBUS

JB400

*In case of no special options leave blank.

Special Options

Painting

Gray Munsell

Identification Plate

Without certification

Housing Material

Aluminum

SMAR JB400 User manual

SMAR JB400 User manual

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